Gas-engine.



No. 810,495. PATENTED JAN. 23, 190

W. G. MILLER. GAS ENGINE.

APPLICATION FILED MAR.30, 1905.

4 SHEETS-SHEET 1.

WITNESSES: INVENTOR ATTORNEYS PATENTED JAN. 28, 1906.

W. G. MILLER. GAS ENGINE. APPLICATION FILED MAR.30,1905.

4 SHEETS-SHBET 2.

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ATTORNEYS No. 810,495. PATENTED JAN. 23, 1906.

W. G. MILLER.

GAS ENGINE. APPLICATION FILED MAR.30,1905.

4 SHEETS-SHEET 3.

WlT/VESSES:

[/VVE/VTOR. 7446: Jill Zer A I! I M ATTORA/EKS No. 8103195. PATENTEDJAN. 23, 1906. W. e. MILLER; GAS ENGINE. APPLICATION FILED MAR.30,1905.

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INVENTOR 74. Miller A TTOH/VEKS WILLIAM GEORGE MILLER, OF WESThlED'WA-Y, MASSACHUSETTS.

GAS-ENGINE.

Specification of Letters Patent:

Patented Jan. 23, 1906.

Application flied-March so, 1905. Serial No. 252,937.

To all whom it incl/y concern:

Be it known that I, WILLIAM Gnoaen MIL- LER, residing at West Medway, inthe county of Norfolk and State of Massachusetts, have invented certainnew and usei'ni improve ments in Gas-Engines, of which the following isa-specification.

My invention relates to certain new and useful improvementsin'gas-engines of the'twocycle type; and it primarily seeks to providean engine of this character of a very simple and economical constructionwhich will readily and effectively serve its intended purposes and inwhich all of the Working parts of the engine are located withinthe'engine-casing.

The invention also seeks to provide an en-' gine in which the inlet andexhaust ports to piston and in which independent means are provided forclosing the exhaust-ports before the new charge of working agent passesinto the explosion-chamber and just after the exploded mixture haspassed out of said chamber, thereby preventing any new charge passingout of the exhaust-ports with the exploded mixture. I

- In its more subordinate nature my invention includes special .meansfor positively operating the independent exhaust-port-closing means andalso the working-agent-inlet valve for the explosion-chamber.

Another object of my invention is to provide means for automaticallydrawing a supply of oil into the casing to thoroughlylubricate themoving parts.

Generically my improved engine comprises a casing including acrank-chamber portion and a piston-chamber portion, a pistonreciprocally movable in the piston-chamber, a crank in thecrank-chamber, a piston-rod connecting the piston with the crank, aninlet-valve carried by the piston for passing the working agentxinto theexplosion-chamber of the easing, a supplemental valve carried by thepiston for closing the explosion-chamber exhaustports, means mountedwithin the casingfor operating both piston-valves automatically.

means for locking the eXhaust-port-closng valve at times, and means fordrawing oil into the casing to oil or lubricate the moving parts.

With other objects in view than have heretofore been enumerated andwhich will here inafter be made apparent, the invention'also includescertain novel combination and arrangemcnt of parts, all of which will befirst described in detail and then specifically pointed out in theappended claims, reference being had to the accompanying'drawings, inwhich Figure 1 18 a perspective view of my invention; Fig. 2 Isalongitudinal section thereof,

showing: the position of'the parts when the engine is operating under anexploded charge. Fig. 8 is a'similar view showing the position of theparts just after the exhaustports have been uncovered. Fig; 4 is asimilar view showing the position of the parts immediately after theexhaust-ports have been covered' up by the supplemental piston-valve.Fig. 5 is a similar view showing the, position assumed by the parts whenthe inlet-valve of ;the piston has been opened. Fig. 6 is a ver- 'ticalcross-section on the line 6 6 of Fig. 3.

Fig. 7 is a cross-section on the line 7 of Fig.3, the explosion-chamberare controlled by the 3. Fig. 8 is a perspective View, partly insection, of the piston and its cooperating valve- 5 members. ing devicesfor holding the supplemental piston-valve to its locked position. 5detail view hereinafter specifically referred to.

Fig. 9 is a detail view of the lock- Fig. 11 is a detail view of the camand latch 3 devices hereinafter referred to.

Referring now to the accompanying drawsections, as clearly shown inFig. 1. Mounted in suitable bearings on the crank-casing'3 is a crank ordrive shaft 6, whose crank port ion -7-rotates within-the casing 3.

Reciprocally mounted in the cylinder 2 is a piston 8 of tubular i'orm,having one end closed by a diaphragm 9, which diaphragm 9 is centrallyapertured, as at 10, to permit passage of the stem 15 of the valve 14:;The diaphragm 9 is also provided on its outer face with avalve-seat 11and is apertured, as at 12, to permit passage of the working agentthere-v through when the valve 14 is ofi its seat in a manner presentlymore fully explained.

The piston 8 toward its closed end or headis provided with a portion 13of reduced diameter to receive the ring or rim 17 of the supplementalvalve. 16, which ring or rim 17 is split, as at 18, to permit properexpansion orcontraction thereof, due to the heat within the workingcylinder- Fig. 10 is a The valve 16 is open at the top, as at 19 19, oneach side of a transverseweb 20, which carries a central stem 21, whichpasses through the stem of the valve 14, the valve-stem 15 being madetubular to receive the stem 21, as

and the, said piston-rod 23 is connected withthe piston 8 by a shortstub-shaft 25, held hearings in the piston-wall.

26 designates a tubular rod having an anglearm 27 at its outer end,which is provided with a segmental portion 28, bent at right angles tothe arm 27, which segmental portion 28 is slotted, as at 29, to receivethe pin30 on the tubular stem 15 of the valve 14. The rod 27 passesthrough a bearing 36 on the piston-rod 23 and is provided with a collar38, between which and the bearings 36 a coil-spring 37 is placed toforce the rod 26 normally-downward. At its lower end the rod 26 isprovided with a heel 31, projected at right angles thereto, which isadapted to be engaged at predetermined times by a cam 32 on a shaft 33,mounted in the walls of the casing 3, which shaft 33 is provided with apinion 34-, which meshes with a gear 35 on the crankshaft 6.

' Mounted within therod 26 for independent longitudinal movement thereinis a second rod 39, which is provided with an angled arm 40, having asegmental portion 41 at right angles to the arm 40 and parallel to theportion 28 of the rod 26, which segmental portion 41 is provided with aslot 42 to' receive the stud or pin 43, carried by the stem 21 of thevalve 16. At its lower end the rod 39 is provided with a right-angledheel 45, similar to the one 31 of the rod 26, which heel is adapted tocooperate with a second cam 46,0n the shaft 33 in a manner presentlymore fully explained. The

, tubular shaft 26 is provided with a slot 44 at its lower end to permitth'erod 39 being forced upwardly within the rod 26 to operate the valve16.

47 designates a latch mounted on the bearing portion 24'of thepiston-rod, which is adapted to engage the lug 45 when the valve 16 isin its normal position 'to hold the said valve 16 in its normal positionon the piston 8. The latch 47 is slidably mounted in'bear'. ings 48 andspring-pressed to itsIocking' positi-on by a spring 49.

50 designates'an arm carried by the latch 47,.Which projects in the pathof a supplemental cam portion 51 on the shaft 34, so that K the latch-47will be disengaged from the lug 45 just prior to the time when the cam46 engages the stud 45 to raise the rod 39 in a manner presently morefully explained. i

52 designates the intake-valve for the easing 3, through which theworking agent is admitted to the casing 3 from the source of supply, thesaid intake-valve beinga one-way valve and adapted to open inwardly toadmit theworking agent to the casing 3, while it will close to preventthe exit of the working agent from the casing 3.

53 53 designate oil-cups which communicate with the interior of thecylinder 2 at such point that when the valve 16 operates the oil will bedrawn into the pockets 54, formed in the piston when the valve 16operates to close the exhaust-ports 5 of the cylinder 2.

A counterweight 55 on the crank-shaft is provided to counterbalance theweight of the piston, the piston-rod, and their carried parts.

Operation: Assume the parts to be in the position shown in Fig. 2, thecasing 3 being filled with working agent and theexplosionchamber of thecylinder 2 being filled with a charge of exploded mixture, the pistonmoving in the direction of the arrow, the. valve 14 being closed, andthe valve 16 being seated the stud 45 of the rod 39 and raises the saidrod, thereby projecting the valve 16 beyond the end of the piston 8 andcovering up. the exhaust-ports 5, it being understood that just prior tothe time the cam 46 engages the stud 45 the supplemental cam portion 51will release the latch 47, as before explained. The parts are now in theposition shown in Fig. 4. As soon as the valve 16 has closed theexhaust-ports 5 the cam 32 engages the stud or heel 31 of the rod26,raising the rod 26, and thereby opening the valve 14 to allow thecompressed working agent from the casing 3 to enter theexplosion-chamber, and the'parts are now in the position shown in Fig.5. As soon as the working cylinder has its explosionchamber-filled witha' 'new charge the heel 31 passes out of the sphere of action of the camchamber 54. As the piston starts on its upstroke the new chargeof.working agent in 32'and the spring 37 returns the valve 14 to "itsclosed position, it-being understood that 120.

tion,

the explosion-chamber will be compressed, and as the piston reaches thelimit of its stroke upwardly the ring 16 will again be seated in itsnormal position on the piston 8, as shown in Fig. 2, while the latch 47will engage the stud i5 and lock the valve 16 in such position, the oilfrom the chamber 5 1 being forced out of the chamber 54 through theslits between the ends of the split ring 17. To aid in returning thevalve 16 to its normal position on the piston 8, I provide adjustablestops 56 57 in the end of the working cylinder 2, which are adapted tothe piston moves upwardly. As soon as the piston has reached thelimit ofitsstroke in the upward direction the compressed charge in theexplosion-chamber is exploded to force the piston downwardly and repeatthe operations just explained. The oil from the oilcups 53 when it isdrawn in by the movement of the valve 16 serves tolubricate the interiorof the Working cylinder, the oil gradually gravitating downwardly intothe crank-casing 3, in which a suificient amount of oil is allowed toaccumulate, so. that the shaft 33, together with its cams 32 46 and itspinion 34, will run in oil and so that the bearing 2& and the crank 7will pass through the oil during a portion of its stroke, so as toautomatically lubricate such parts.

position (shown inFig. 1) passes through the split portion 18 of thering 17 into the explosion-chamber, collects onthe top of the piston 8and in the spaces 19 19, and serves to lubricate the stem 21, as Wellasto lubricate the stem 15 and valve 14, the oil dripping down onto thestud-shaft 25, and the cooperating bearing of "the piston-rod 23 servesto automatically lubricate the said bearing of thepiston-rod. .It willhe therefore seen that all the parts of my improved engine are autoinatioally lubricated by oil from the oil-clips 53. A draw-off cook 58may be provided for drawing off the excess oil from the casing 3, ifdesired.

From the foregoing description, taken in connection with theaccompanying drawings, it will be seen that 1 have provided a verysimple and effectively-operating engine in which, the exhaust-ports arepositively closed before the new charge enters the explosion-chamber andalso in which means are provided for automatically lubricatingthevarious operative parts of the engine..- It is also thought that fromthe foregoing the complete operaconstruction, and many advantages of myinventionwillbe readily understood by those skilled in the art to whichit appertains, and while I have shown. and described the respective rods39 and 26 the one within the other yet the said rods may be made withoutengagement with each other and simply disposed parallelly to oneanother, as shown dia- "grammatically in. Fig. 10. The, are upon beengaged by the valve 16 as The oil forced out of the pockets said pistonadapted to .draw the 54 when the valve 16 is returned to its normalagent into the said other compartment during plosion-chamber,

which the slots 29 and 42, respectively, are f rmed are concentricwiththe axis of the stub-shaft 25 to allow for the lateral movement of thepiston-rod 23 during the operation of the engine.

Having thus described my invention, What I claim, and desire to secureby Letters Patcut, is-

1. An engine comprising a casing, a piston l reciprocally movabletherein and dividing the casing into two compartments, one of saidcompartments forming the explosion-chamber, an inlet-valve to the othercompartment, said piston adapted to draw the working agent into the saidother compartment during one portion of its'stroke, said casing havingpiston-controlled exhaust-ports for the explosionchamber, means carriedby the piston forpass ing the working agent into the explosion: chamberfrom the other chamber, and means. carried by the piston for closing theexhaust ports in advance of the admission of said working agent,substantially'as shown and described.

2. An engine comprising a casing, a piston reciprocally movable thereinand dividing the easing into two compartments, one of said compartmentsforming the explosion-chamher, an inlet-valve to theother compartment-,-

Working 5 one portion of its stroke,'said casing havingpiston-controlled exhaust-ports for the "ex-1 means carried thepistonfor chamber from the'other chamber, means car ried by the pistonfor closing the exhaust port in advance of the admission of said working agent, and means mounted within the casing for automaticallyoperating said firstmentioned piston-carried means. i I

3. An engine comprisinga casing, a piston reciprocally movable therein,and dividing the easing into two compartments, one .of said compartmentsforming the explosion-cham- "1 10 her, an inlet-valve to the othercompartment, said piston adapted to draw the working agent into the saidother compartment during one portion of its stroke, said casing havingpiston-controlled exhaust-ports. for the explosion-chamber, meanscarried by the piston for passing working agentintothe explosionvchamber from the other chamber, means car; ried by the piston forclosing the exhaust-portin advance of the admission of said workingagent, and means mounted within the casing for automatically operatingsaid second-mew tioned piston-carried means. I

' An engine comprising a casing, a piston I reciprocally movable thereinand dividing the 12 5 easing into two compartments, one of saidcompartments forming the explosion-chamber, an inlet-valve to the othercompartment, said piston adapted to draw the Working agent .into thesaid other compartment during one I3 passing working agent into theexplosion: 10o

portion of its stroke, said casing having piston-controlledexhaust-ports for the explosion-chamber, means carried by the pistonposite direction,

munication with each other, a piston operatable in the working cylinder,a crank-shaft rotatably mounted in the crank-casing, a piston-rodconnecting said crank-shaft with said piston, an intake-valve for saidcrank-casing, said piston arranged to draw workingagent into saidcrank-casing when moving in one direction and to compress the workingagent.

in the crank-casing when moving in the opan inlet-valve in the piston:

head for passing the working agent from the crank-casing intotheexplosiOn-chamber of the cylinder, said cylinder having exhaustportsadapted to normally beclosed by said piston and opened when the pistonis at the limit of its stroke in one direction, and valvecontrollingmeans carried by the piston, all being arranged substantially as shownand described.

6. In an engine of the character stated, a

working cylinder and a crank-casing in communication with each other, apiston operat able in the working cylinder, a crank-shaft rotatablymounted in the crank-casing, a piston-rod connecting said crank-shaftwith said piston, an intake-valve for saidcrank-casing, said pistonarranged to draw working agent into said crank-casing when moving in onedirection and to compress the agent in the crank-casing when moving inthe opposite direction, an inlet-valve in the piston-head for passingthe working agent from the crankcasing into the explosion-chamber of thecyl inder, said cylinder having exhaust ports adapted to be closed bysaid piston and'opened when the piston is at the limit of its stroke inone direction, an exhaust-valve carried by the piston, means forautomatically opening-said inlet piston-valve, and means forautomatically moving said exhaust-controlling-valve to close the saidexhaust-'ports in advance of the opening of the inlet-valve.

p 7-. In an engine of the character stated, a working cylinder and acrank-casing in communication with each other, a piston'operatable inthe working cylinder, a crank-shaft 'rotatably mounted in i 'thecrank-casing, a pis: ton-rod connecting said crank-shaftwith saidpiston, an intake-valve for said crank-casing, said piston arranged todraw working agent into said crank-casing when moving in one directionand to compress the working agent i n'the crank-casi rig when moving inits oppoi when the piston is at'the slates site direction, aninlet-valve in the pistonhead for passing the working agent from thecrank-casing into the explosion-chamber of the cylinder, said cylinderhaving exhaustports to be normally closed by saidpisto'n'and opened whenthe piston is at the limit of its stroke in one direction, anexhaust-valve carried by the piston, means for automatically openingsaid inlet piston-valve, cans for automatically moving said,exhaust-controlling valve to close the exhaust-ports in advance ofthe'opening of inlet-valve, and means for returning-said inlet-valve toits seat.

8. In an engine of the character stated, a working cylinder and a crankcasing in communication with each other, a piston operatable in theworking cylinder, a crank-shaft rotatably mounted in the crank-casing, apistonrod connecting said crank-shaft with said pis ton, an intake-valvefor said crank-casing, said piston arranged to draw working-agent intosaid crank-casing when moving in one direction and ,to compress theagent in the crankcasing when moving in the opposite direction,

an inlet-valve 1n the piston-head for passing the working agent from-thecrank-casing into the explosion-chamber of the cylinder, said cylinderhaving exhaust-ports adapted to be normally closed by 'said'piston andopenedv limit of its stroke in one direction, an exhaust-valve carriedbythe piston, means for automatically opening said inlet piston-valve, andmeans for automatically moving said eXhanst-controlling valve to closethe said exhaust-ports in advance of the opening of the inlet-valve,andmeans for returning said exhaust-controlling valve to its seat.

9. In an engine ot' the character stated, a working"cylinder andacrank-casing in comable in thelworking cylinder, a crankrshaft'rotatablymounted in the crank-casing, a pistonrod connecting. said crank-shaftwith said pis-. ton, an intake-,valve for said crank-casing, said pistonarranged to draw working agent into said crank-casing when moving in onedirection and to'compress theagent in the crank- ,casing when moving inthe opposite direction, an inlet-valve inthe piston-head for passing theworking agent from the crank-casing into the explosion-chamber of thecylinder, said 'munication with each other, a piston-operatcylinderhaving exhadst-ports adapted to be" closed by said piston and openedwhen the piston-is at the limit of its stroke in one direction, a'nexhaust-valve carried by the piston, means for automatically openingsaid inlet piston-valve, means for automatically moving saidexhaustcontrolling valve to close the exhaust-ports in advance of'the'opening of the inlet-valve, and means for locking said exhaust-valvetoits seat at times.

10. In an engine of the character stated, a working cylinder and acrank-casing in communication with each other, a piston operatable inthe working cylinder, a crank-shaft r tatably mountedin'thecrank-casing, .a pistonrod connectingsaid crank-shaft with saidpiston, an-intakeivalvefor said crank-casing, said piston arranged todraw working agent into said'crank-casing when moving in onedirection'an'd to compress the agent in the crankcasing when moving inthe'opposite direction, an inlet-valve in the piston-head forv passingthe working agent from the crank-casing into the explos on-chamber ofthecylinder, said cylinder having exhaust-ports adapted to be bysaidfpistonand opened when the piston-is'atthe limitoi its stroke in onedirec- 131011;"821 exhaustyalve carried by the piston,

' ingiof'theintake-valve,

, int

. tion of its stroke' and to means an automatically opening said inletprstomva'lve, and means for automatically moving said exhaust-controlling valve to close the-said exhaust-ports inadvanoe of the openmeans for locking said exhaust'valve to, itflsfseatattimes," and meansfor automatically releasing said'looking means at times.

a 1 1. An'eng'inecomprisingaflworking cylin er a "piston reciprocally"mounted therein, piston adapted to draw working agent one end of said.cylinder durin'gfone-p'on tio'nof its stroke and to compress saidworking agent on the return portionj ofits stroke, an inlet-valve in thepiston head adapted "to open at predetermined times to admit said said icompressed working agent into theexplosion r chamberof the cylinder,said cylinder having piston-controlled exhaust ports substantiallyasshown and described.

12. An engine comprising aworkin'g cyiinde r. a 'pisten' -reciprooallymounted lthe'rein, sald piston adapted to' draw working agent into oneend of said cylinder during oneporcompresssaid "working agent on theZreturnof its stroke, aninlet-valve in the piston head adapted too-penat predetermined times to admitsaid com.-

pressed working agent into the e'xplosiom' chamber of the cylinder, saidcylinder having piston-controliedexhaust-ports, and supplementai meanscarried by the piston for closingsaid exhaust ports after the explodedmixture has escaped therethrough and before the opening of the pistoniniet-valve 13. In an engine of the class described, a working cylinderand a piston operatable thereirnand an automatically-operated meanscarried by the piston for drawing Oll into-the cylinder to lubricatethe. moving parts, and

an oil-containing vessel in communication with said cylindersubstantially asshown and described f 14:. In an engine or the classdescribed, a working cylinder and a crank-casing, a piston reciprocallymounted in" the working cylinder', a crank-shaft .mounted in thecrank-cas ing, a pistomro'dconnecting the crank-shaft to thepiston,-said piston having'its head ap- 'ertured and provided with avalve-seat, an inlet-valvecarried by said piston with its stem passingthrough the piston-head, a valve-0perating rod for said inlet-valveconnected to its stem and held in bearings on the pistonrod, cam deviceswithin thecrank-casing for engaging said rod at times to open the valve,said cylinder having piston-controlled exhaust-ports, substantially asshown and .described.

working cylinder and a crank-casing, a piston reciprocally mounted inthe Working cylinder, a crank-shaft mounted in the crank-casing, apiston-rod connecting the crank-shaft to the piston, said piston havingits head ap ertured and provided with a valve-seat, an inlet-valvecarried by said piston with its stern passing through the piston-head, avalve-operating rod for said inlet-valve connected to its stem and heldin hearings on the pistonrod, cam devices within the crank-casing forengaging said rod at times to open the valve, said cylinder havingpiston-controlled exhaust-port's, and a supplemental val ve' carried bythe piston for closing said exhaust-ports at times,

reciprocally mounted in the working cylinder,a crank-shaft mounted inthe crank-casing,-a piston-rod connecting the crank-shaft to thepistomsaid piston having its head apertured and provided with avalve-seat, an inlet-valve carried by said piston' withits stem passingthrough the'piston-head, a valve-op- 'its sternand vheld inv bearings onthe pistonrod, camdevices within the crank-casingfor engaging said rodat times to open the valve,- said cylinder having piston-controlledexhaust-ports, and a supplemental valve carried -bythe piston forclosing said exhaust-ports the cylinder and crank-casing for positivelyoperating said supplemental valve.

l7. 1n an engine of the class described, a working cylinder and acrank-casing, a piston reciprocally mounted in the working cylinder, acrank-shaft mounted in the crank-casm ing, a piston-rod connecting thecrank-shaft to the piston, said piston having its head apertured andprovided with a valve-seat, an in- 'le't=valve carried by said pistonwith its stem passing through the piston-head, a valve-opits stem andheld in hearings on the pistonrod, cam devices within the crank-casingfor engaging saidfrod at times to open the valve, said cylinder havingpiston controlled exhaust-ports, a supplemental valve carried by times,and cam-controlled devices within the 15. In an engine of the classdescribed, a-

1-6. In an engine of the class described, a. working cylinder and'acrank-casing, a piston erating rod for said inlet-valvev connected to attimes, and cam-controlled. devices within crating rod for saidinlet-valveconnected to thepiston for closing said exhaust ports at,

cylinder and crank-casing for positively operatirig said supplementalvalve in advance of the opening of the piston inlet-valve.

18. In an engine of the class described, a

7 working cylinder and a crank-casing, a piston reciprocally mounted inthe working cylinder, a crank-shaft mounted in the crank-caslng, apiston-rod connecting the crankshaft to the piston, said piston havingits head apertured and provided with a valve-seat, an inlet-valvecarried by said piston with its stem passing through the piston-head, avalve-operatingrod for saidinlet-valve connected to its stem and heldinbearings on the rod, cam devices within the crank-casing for engagingsaid rod at times to open the valve, said cylinder havingpiston-controlled exhaust-ports,

, a supplemental valve carried by the piston .for closing saidexhaust-ports at times, camcontrolled devices within the cylinder andcrank-casing for positively operating said supplemental valve in advanceof theopening of the piston inlet-valve, means for locking saidsupplemental valve to its normal posi 'tion andsupplemental cam deviceswithin the crank-casing for releasing said locking means at times.

19. In an engine of the character stated, a

working cylinder, a crank-casing connected to one end thereof, a hollowpiston, closed at one end, reciprocally mounted within theworkingcylinder,-said working cylinder having exhaust-ports adapted to beclosed at times by said piston, a crank-shaft mounted in saidcrank-casing, a piston-rod connecting said crankshaft to said piston,said piston having its closed end formed of reduced drameter to providean annular seat, ,said piston having its closed end provided withapertures and a valve-seat, an inlet-valve having. a hollow stemprojected through said pistonhead and adapted to-normally seat on saidvalve-seat in the piston-head, a tubular rod mounted in hearings on thepiston-rod and having one end in engagement with said tubular stem ofthe piston-head valve, said tubular rod having a cam-engaging foot atits free end, a supplemental valve having an annular ring adapted toseat in said annular seat of the piston and having a stem passingthrough the hollow stem of the first-mentioned piston-valve, a secondrod held within-said first-mentioned rod and having one end connected tosaid stem of the supplemental valve and having its free 'endprovidedwith a camengaging heel, cams mounted within said crank-casing forcooperating with the heels of said rods, a gear mounted on saidcrankshaft, a pinion connected with said cams and said gear whereby themotion of the crank-f shaft is imparted to the cams, said cams be ing soarranged as to operate said supple mental valve in" advance of saidfirst-mentioned piston-valve to close the exhaust-ports of the workingcylinder, a crank casing connected to one end thereof, a hollow pistonopen at one end reciprocally mounted within the working cylinder, said.working cylinder having exhaust-ports adapted to be closed at times bysaid piston, a crank-shaft mounted in said crank-casing, a piston-rodconnecting said its closed end formed of reduced diameterto its closedend provided with apertures and a valve-seat, an inlet-valve having ahollowstem projected through said piston-head and adapted to normallyseat on said valve-seat in the piston-head, a tubular rod mounted inbearings on thepiston-rod and having one end in engagement with thetubular stern of the pistonhead valve, said tubular rod having acamengaging-foot at its free end, a supplemental in said annular seat ofthe piston and having a stem passing through the hollow stem of thefirst mentioned piston -valve, a second rod stem of thesupple'mentalvalve and having its free end provided with a camengagingheel, cams mounted within said "crank-casing for cooperating with theheels of said rods,,a' gear mounted insaid crankshaft, a pinionconnected with said cams and nected to said shaft is imparted to thecams, said cams being so arranged as to operate said supplementalvalvein advance of said first-mentioned piston-valve to close theexhaust-ports of the working cylinder in advance of the admission of anew chargeof working agent into communicating with the interior of saidworking cylinder at a point in alinement with the juncture between thelarge and reduced portions of the piston so that when thesupplementalvalveis operated the same will draw in a supply of oil' fromthe oil-containers to ing cylinder andcrank-casing, a latch forcooperating with the first mentioned tubular I to its seat, and asupplemental cam'member fortri'pping said latch at times to release saidprovide an annular seat, said piston having valve having an annular ringadapted to seat.

lubricate the moving parts within the work- 20. In an engine of thecharacter stated, a

crank-shaft to said piston, said piston having ioo within said tubularrod, having one end consaid gear whereby the motion of the cranktheexplosion-chamber oil-containing vessels v rod to hold thefirst-mentioned piston-valve latch from operativeeonnection with: the'first- I mentioned tubular rod, all being arranged substantially asshown and, described;

21. An' engine comprising a casing including a crank and apiston-chamber,- a piston re- 'cip oeally movable'in the piston-chamber,a crank-shaft, mounted; in bearings 1nthe eas ingg a. I piston-rodconnecting the piston with [the crank-shaft, inlet-valves carried by thepiston for pa'ssing'the working agent into the I explosion ehamber ofthe casing; a supplemental valve carried by the piston for closingtheexplosion-chamber exhaust-ports, means mounted Within the casing foroperating both piston-valves automatically, means for lock- 5

